Python核心编程——第四章Python对象

#! /usr/bin/env python
'''typechk.py'''
def displayNumType(num):
    print num, 'is',
    if isinstance(num, (int, long, float, complex)):
        print 'a number of type:', type(num).__name__
    else:
        print 'not a number at all!'
displayNumType(-69)
displayNumType(99999999999999999999L)
displayNumType(99999999999999999999)
displayNumType(98.6)
displayNumType(-5.2+1.9j)
displayNumType('aaa')
#######
# output
#######
-69 is a number of type: int
99999999999999999999 is a number of type: long
99999999999999999999 is a number of type: long
98.6 is a number of type: float
(-5.2+1.9j) is a number of type: complex
aaa is not a number at all!

#! /usr/bin/env 
python
'''typechk.py'''
def displayNumType(num):
    print num, 'is',
    if type(num)==type(0):
        print 'an integer'
    elif type(num)==type(0L):
        print 'a long'
    elif type(num)==type(0.0):
        print 'a float'
    elif type(num)==type(0+0j):
        print 'a complex number'
    else:
        print 'not a number at all!'
displayNumType(-69)
displayNumType(99999999999999999999L)
displayNumType(99999999999999999999)
displayNumType(98.6)
displayNumType(-5.2+1.9j)
displayNumType('aaa') 
#######
# output
#######
-69 is an integer
99999999999999999999 is a long
99999999999999999999 is a long
98.6 is a float
(-5.2+1.9j) is a complex number
aaa is not a number at all!

#! /usr/bin/env 
python
import types
'''typechk.py'''
def displayNumType(num):
    print num, 'is',
    if type(num)==types.IntType:
        print 'an integer'
    elif type(num)==types.LongType:
        print 'a long'
    elif type(num)==types.FloatType:
        print 'a float'
    elif type(num)==types.ComplexType:
        print 'a complex number'
    else:
        print 'not a number at all!',
        
        print 'but, it is',
        if type(num)==types.StringType:
            print 'a string'
        
displayNumType(-69)
displayNumType(99999999999999999999L)
displayNumType(99999999999999999999)
displayNumType(98.6)
displayNumType(-5.2+1.9j)
displayNumType('aaa')
#######
# output
#######
-69 is an integer
99999999999999999999 is a long
99999999999999999999 is a long
98.6 is a float
(-5.2+1.9j) is a complex number
aaa is not a number at all! but, it is a string